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Question

Boron compounds behave as Lewis acids because of their :

A
acidic nature.
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B
covalent nature.
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C
ionic nature.
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D
vacant orbital.
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Solution

The correct option is D vacant orbital.
A Lewis acid is an electron pair acceptor, while Lewis base is an electron pair donor.
Boron compounds behave as Lewis acids because of their vacant orbital .Its octet is incomplete, in which boron can accept an electron.

Hence, option D is correct.

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